Aligned everything to npm to match what the Dockerfile already uses
(`npm ci --legacy-peer-deps`) and the committed `package-lock.json`.
The sibling `ms-agent-dotnet` integration uses the same npm-based
setup, so npm is the established convention.
Changes:
- playwright.config.ts: webServer.command now `npm run dev` (was `pnpm dev`),
so local E2E works in environments without pnpm installed.
- package.json: removed the redundant top-level `pnpm.overrides` block.
The equivalent override is already declared under npm's `overrides`
field, so the pnpm block was dead weight given that npm is canonical.
- package.json: `scripts.dev` now uses `concurrently -k --success first`
so a crashing .NET agent surfaces during local dev instead of leaving
Next running headlessly.
Jordan Ritter